Hydrogenation of adiponitrile catalyzed by raney nickel use of intrinsic kinetics to measure gas-liquid mass transfer in a gas induced stirred slurry reactor

✍ Scribed by C. Matthieu; E. Dietrich; H. Delmas; J. Jenck

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 586 KB
• Volume: 47
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(92)87049-v

✦ Synopsis

Three phase hydrogenation of adiponitrile (ADN) to hexamethylene diamine (HMD) proceeds via aminocapronitrile (ACN). In a first step it has been investigated in selected conditions of temperature, pressure, reagent and catalyst concentrations, avoiding external and intraparticle transfer limitations. Based on initial reaction rates, a Langmuir Hinshelwood model has been selected, involving limiting surface reaction between dissociate hydrogen and nitriles adsorbed on different sites. From concentration profiles different ACN adsorption coefficients depending on ADN concentration have been derived and explained by amine-n&rile interactions. Additional runs performed at lower stirring speeds have then been analysed using the intrinsic kinetic law to estimate the gas-liquid and liquid-solid mass transfer parameters. Comparison with parallel physical measurements performed in the same equipment but without reaction is discussed.